The modern reef aquarium tends to utilize a more natural form of filtration to maintain the best water quality. This is typically a combination of live sand and live rock from the ocean. Unfortunately, real live rock is quite expensive, $5 to $10 per pound, and the recommended about is about two pounds per gallon of aquarium. This can easily cost hundreds of dollars. In addition, harvesting real live rock can do damage to out precious coral reefs.
This manual describes how to make your own live rock from common materials found locally. It makes a great family project, helps protect our coral reefs and best of all, only costs about 25 cents per pound to make!